In answer to your question:
I can, in fact bwaawk like a hen.
( conversationally ) Bwaaawk, bwaaawk, bwaaawk.
( with excitement ) BWaaaawk!
( self-satisfied, or petulant, oddly the same )Bwawk.
and ( because there are always such moments ) Bwaawk?
It's a skill; it's a talent; it's an art.
For other animal visions, see
WWP Trip to the Zoo